I read on the internet about a book called : develop a deeper voice by Pierre Kirouac and MAxime Bellemare, it's about getting a deeper voice. Anybody in here read it? If not, anybody in here know how to get a deeper voice? There must be exercices for that somewhere, anybody in here know any?

Try stretching your range like for a warm up. I do this by singing in chromatics and go from my lowest note F to as high as I can go. I found that when I do this, my vocal chords allow me to go two whole steps lower than F. Try that.

You may not deepen your voice dramatically but a few extra notes can't hurt.